[issue42590] Something like Rust's std::sync::Mutex – combining a mutex primitive and a piece of data it's protecting

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[issue42590] Something like Rust's std::sync::Mutex – combining a mutex primitive and a piece of data it's protecting

New submission from Jakub Stasiak : I've been wondering if it's worth it to have something like Rust's std::sync::Mutex[1] which is used like this: let data = Mutex::new(0); { let mut unlocked = data.lock().unwrap(); *unlocked += 1; } // unlocked is no longer